First there was Darth Tater, evil potato emperor. Now, on the heels of the Transformers comes Optimash Prime, the rock ‘em sock ‘em leader of the Autospuds who have come to Earth to save us from a severe mashing by the Deceptipotatoes (or some starchy situation like that). They are selling well at first invasion: Vicky, a sales associate at the Culver City, Calif., Target said, “They’re flying off the shelves ... kids and adults both like them.”